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arXiv 1802.07574math.AT
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高阶Hochschild同调与指数函子

Higher Hochschild homology and exponential functors

Geoffrey Powell, Christine Vespa

AI总结:

该研究将圆楔和上的高阶Hochschild同调视为自由群范畴函子,引入外函子范畴,用多项式外函子刻画该同调,在特征零域得到显式计算,提供非平凡多项式外函子的自然来源。

摘要:

我们研究在圆的楔和上取值的高阶Hochschild同调,将其视为自由群范畴上的一个函子。主要结果采用来自平方零扩张的系数;这一设定的动机源于Turchin和Willwacher与毛图上同调相关的工作。函子视角使我们能够运用多项式函子理论、指数函子等工具。我们还引入并关键使用了外函子范畴,即自由群上内自同构作用平凡的函子的满子范畴。我们用内蕴定义的多项式外函子描述了高阶Hochschild同调;还在特征零的域上,得到了这些外函子的若干显式计算结果。特别地,高阶Hochschild同调给出了非平凡多项式外函子的一个自然来源。

英文摘要:

We study higher Hochschild homology evaluated on wedges of circles, viewed as a functor on the category of free groups. The main results use coefficients arising from square-zero extensions; this is motivated by work of Turchin and Willwacher in relation to hairy graph cohomology. The functorial point of view allows us to exploit tools such as the theory of polynomial functors and exponential functors. We also introduce and make essential use of the category of outer functors, the full subcategory of functors on free groups on which inner automorphisms act trivially. We give a description of higher Hochschild homology in terms of intrinsically defined polynomial outer functors; we also obtain several explicit computations of these outer functors, working over a field of characteristic zero. In particular, higher Hochschild homology gives a natural source of non-trivial polynomial outer functors.

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